(a) On and after the date on which the initial performance test, required by Rule 260.8, is completed, but no later
than 180 days after initial startup, each owner or operator subject to the provisions of this subpart shall comply
with the following conditions:

For each undertread cementing operation:

(i) Discharge into the atmosphere no more than 25 percent of the VOC used (75 percent emission reduction) for each
month; or

(ii) Maintain total (uncontrolled) VOC use less than or equal to the levels specified below, depending upon
the duration of the compliance period: